Rivet analyses referenceDM1_1980_I140174Cross section for $e^+e^-\to\pi^+\pi^-\pi^0$ at energies between 0.75 and 1.1 GeV.Experiment: DM1 (ACO) Inspire ID: 140174 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to\pi^+\pi^-\pi^0$ at energies between 0.75 and 1.1 GeV. Source code: DM1_1980_I140174.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4#include "Rivet/Projections/UnstableParticles.hh"
5
6namespace Rivet {
7
8
9 /// @brief Add a short analysis description here
10 class DM1_1980_I140174 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1980_I140174);
15
16
17 /// @name Analysis methods
18 //@{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 // Initialise and register projections
23 declare(FinalState(), "FS");
24 declare(UnstableParticles(), "UFS");
25 book(_n3pi, "TMP/3pi");
26 }
27
28
29 /// Perform the per-event analysis
30 void analyze(const Event& event) {
31 const FinalState& fs = apply<FinalState>(event, "FS");
32
33 map<long,int> nCount;
34 int ntotal(0);
35 for (const Particle& p : fs.particles()) {
36 nCount[p.pid()] += 1;
37 ++ntotal;
38 }
39 if(ntotal==3 && nCount[211] == 1 && nCount[-211] == 1 && nCount[111] == 1)
40 _n3pi->fill();
41 }
42
43
44 /// Normalise histograms etc., after the run
45 void finalize() {
46 double sigma = _n3pi->val();
47 double error = _n3pi->err();
48 sigma *= crossSection()/ sumOfWeights() /nanobarn;
49 error *= crossSection()/ sumOfWeights() /nanobarn;
50 Scatter2D temphisto(refData(1, 1, 1));
51 Scatter2DPtr mult;
52 book(mult, 1, 1, 1);
53 for (size_t b = 0; b < temphisto.numPoints(); b++) {
54 const double x = temphisto.point(b).x();
55 pair<double,double> ex = temphisto.point(b).xErrs();
56 pair<double,double> ex2 = ex;
57 if(ex2.first ==0.) ex2. first=0.0001;
58 if(ex2.second==0.) ex2.second=0.0001;
59 if (inRange(sqrtS()/MeV, x-ex2.first, x+ex2.second)) {
60 mult->addPoint(x, sigma, ex, make_pair(error,error));
61 }
62 else {
63 mult->addPoint(x, 0., ex, make_pair(0.,.0));
64 }
65 }
66 }
67
68 //@}
69
70
71 /// @name Histograms
72 //@{
73 CounterPtr _n3pi;
74 //@}
75
76
77 };
78
79
80 // The hook for the plugin system
81 RIVET_DECLARE_PLUGIN(DM1_1980_I140174);
82
83
84}
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